Stablization of oxidation-sensitive or UV-sensitive active ingredients

ABSTRACT

Cosmetic and dermatological formulations comprising at least one hydrophilic active ingredient and at least one dialkyl naphthalate which is characterized by the structural formula 
                         
in which R 1  and R 2 , independently of one another, are selected from the group of branched and unbranched alkyl groups having 6 to 24 carbon atoms, have been found to be stable and effective, particularly in moisturizing the skin or protection the skin from skin aging.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation application of PCT/EP02/09374, filed Aug. 22,2002, which is incorporated herein by reference in its entirety, andalso claims the benefit of German Priority Application No. 101 41 472.2,filed Aug. 29, 2001.

FIELD OF THE INVENTION

The present invention relates to the use of alkyl naphthalates forimproving the effectiveness of hydrophilic active ingredients incosmetic or dermatological preparations. The present inventionpreferably relates to the use of alkyl naphthalates for improving theeffectiveness of water-soluble skincare substances—such as, for example,biotin, carnitine, flavonoids, such as alpha-glucosylrutin, ascorbicacid and the like—and to cosmetic or dermatological preparations inwhich such active ingredients can be stored in stable form over a longperiod and which represent a good transport means for these activeingredients.

BACKGROUND OF THE INVENTION

Cosmetic skincare serves primarily to strengthen or restore the naturalfunction of the skin as a barrier against environmental influences (e.g.dirt, chemicals, microorganisms) and against the loss of substancesintrinsic to the body (as well as water, also natural fats,electrolytes, etc.).

Impairment of this function may lead to increased resorption of toxic orallergenic substances or to attack by microorganisms, resulting in toxicor allergic skin reactions.

A further aim of skincare is to compensate for the loss by the skin ofsebum and water caused by daily washing. This is particularly importantwhen the natural regeneration ability is inadequate. Furthermore,skincare products should protect against environmental influences, inparticular against sun and wind, and delay skin ageing.

Chronological skin ageing is caused, for example, by endogenous,genetically determined factors. As a result of ageing, the followingstructural damage and functional disorders, which can also fall underthe term “senile xerosis”, arise in the epidermis and dermis:

a) dryness, roughness and formation of dryness wrinkles,

b) itching and

c) reduced refatting by sebaceous glands (e.g. after washing).

Exogenous factors, such as UV light and chemical noxae, can have acumulative effect and, for example, accelerate or supplement theendogenous ageing processes. In the epidermis and dermis, for example,the following structural damage and functional disorders may arise inthe skin in particular as a result of exogenous factors; these are morefar-reaching than the degree and quality of the damage in the case ofchronological ageing:

d) visible vascular dilations (teleangiectases, couperosis);

e) flaccidity and formation of wrinkles;

f) local hyperpigmentation, hypopigmentation and abnormal pigmentation(e.g. age spots) and

g) increased susceptibility to mechanical stress (e.g. cracking).

SUMMARY OF THE INVENTION

The present invention relates in particular to products for the care ofskin aged in a natural way, and for the treatment of the consequentialdamage of photoageing in particular of the phenomena listed under a) tog), preferably those which are characterized by increased effectiveness.

In particular, the present invention relates to cosmetic preparationswith effective protection against harmful oxidation processes in theskin, but also for the protection of cosmetic preparations themselves orfor the protection of the constituents of cosmetic preparations againstharmful oxidation processes.

The present invention further relates to antioxidants, preferably thosewhich are used in skincare cosmetic or dermatological preparations. Inparticular, the invention also relates to cosmetic and dermatologicalpreparations comprising such antioxidants. In a preferred embodiment,the present invention relates to cosmetic and dermatologicalpreparations for the prophylaxis and treatment of cosmetic ordermatological changes in the skin, such as e.g. skin ageing, inparticular skin ageing caused by oxidative processes.

In addition, the present invention relates to active ingredients andpreparations comprising such active ingredients for the cosmetic anddermatological treatment or prophylaxis of erythematous, inflammatory,allergic or autoimmunoreactive phenomena, in particular dermatoses.

In a further advantageous embodiment, the present invention relates toactive ingredient combinations and preparations which serve for theprophylaxis and treatment of photosensitive skin, in particular ofphotodermatoses.

The harmful effect of the ultraviolet part of solar radiation on theskin is generally known. The rays have different effects on the skinorgan depending on their particular wavelength: so-called UV-C radiationwith a wavelength below 290 nm is absorbed by the ozone layer in theearth's atmosphere and therefore is of no physiological importance. Bycontrast, rays in the range between 290 nm and 320 nm, the so-calledUV-B region, cause erythema, simple sunburn or even burns of greater orlesser severity. A maximum for the erythema activity of sunlight isstated as being the relatively narrow range around 308 nm.

Numerous compounds are known for protecting against UV-B radiation,examples thereof being derivatives of 3-benzylidenecamphor, of4-aminobenzoic acid, of cinnamic acid, of salicylic acid, ofbenzophenone, and of triazine.

It has long been incorrectly assumed that the long-wave UV-A radiationwith a wavelength between 320 nm and 400 nm has only a negligiblebiological effect. However, it has now been proven by numerous studiesthat UV-A radiation is far more hazardous than UV-B radiation withregard to the triggering of photodynamic, specifically phototoxic,reactions and chronic changes in the skin. The harmful effect of UV-Bradiation can also be further intensified by UV-A radiation.

Thus, it has been proven, inter alia, that even UV-A radiation underentirely normal everyday conditions is sufficient to damage within ashort time the collagen and elastin fibers which are of essentialimportance for the structure and firmness of the skin. This results inchronic photoinduced changes in the skin—the skin “ages” prematurely.The clinical appearance of skin aged by light includes, for example,wrinkles and lines and an irregular, furrowed relief. In addition, theareas affected by photoinduced skin aging may have irregularpigmentation. The formation of brown spots, keratoses and evencarcinomas or malignant melanomas is also possible. Skin agedprematurely by everyday exposure to UV is additionally characterized bya lower activity of the Langerhans cells and a slight chronicinflammation.

It is therefore of fundamental importance that cosmetic anddermatological photoprotective preparations offer adequate protectionboth against UV-B and also against UV-A radiation.

The prior art also recognizes a series of different efficient,hydrophilic skincare active ingredients—such as, for example, biotin,carnitine, flavonoids, such as alpha-glucosylrutin, ascorbic acid andthe like—whose use in cosmetic and dermatological formulations, inparticular in formulations of the oil-in-water type, is very desirable.Sadly, however, such substances are often very unstable meaning that,particularly in aqueous media, they rapidly decompose and in so doinglose their effectiveness. Moreover, since they are poorly soluble inoil, an effective concentration of hydrophilic active ingredients canonly be achieved with difficulty even in nonaqueous systems.

A further object of the present invention was therefore, in particular,to overcome the disadvantages of the prior art and to protecthydrophilic skincare active ingredients, in particular biotin,carnitine, flavonoids, such as alpha-glucosylrutin, and ascorbic acid,from decomposition and thus to increase their effectiveness, preferablyin cosmetic or dermatological preparations. It was also an object tofind cosmetic or dermatological preparations in which hydrophilicskincare active ingredients can be stored in a stable manner over a longperiod and which represent a good transport means for these activeingredients.

It was surprising and could not have been foreseen by the person skilledin the art that

-   -   cosmetic and dermatological formulations containing at least one        hydrophilic active ingredient, characterized in that they        comprise at least one dialkyl naphthalate which is characterized        by the structural formula

-   -   in which R¹ and R², independently of one another, are chosen        from the group of branched and unbranched alkyl groups having 6        to 24 carbon atoms,        overcome the disadvantages of the prior art.

As well as one or more oil phases, the preparations within the meaningof the present invention may preferably additionally comprise one ormore water phases and be present, for example, in the form of W/O, O/W,W/O/W or O/W/O emulsions. Such formulations may preferably also be amicroemulsion, a PIT emulsion, a solids emulsions (i.e. an emulsionwhich is stabilized by solids, e.g. a Pickering emulsion), a sprayableemulsion or a hydrodispersion.

The preparations according to the invention are entirely satisfactorypreparations in every respect which are not restricted to the limitedchoice of raw materials. Accordingly, they are very particularlysuitable for use as bases for preparation forms with diverse applicationpurposes. The preparations according to the invention exhibit very goodsensory and cosmetic properties, such as, for example, extensibility onthe skin or the ability to absorb into the skin, and are furtherdistinguished by very good active ingredient effectiveness coupled withexcellent skincare data.

It could not have been foreseen by the person skilled in the art thatthe use of alkyl naphthalates would better stabilize hydrophilic activeingredients against decomposition. In addition, the use according to theinvention can surprisingly considerably increase the stability ofhydrophilic active ingredients in water-containing cosmetic ordermatological formulations compared with the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The invention therefore also provides for the use of at least onedialkyl naphthalate which is characterized by the structural formula

in which R¹ and R², independently of one another, are chosen from thegroup of branched and unbranched alkyl groups having 6 to 24 carbonatoms, for improving the effectiveness and increasing the stability ofhydrophilic active ingredients in cosmetic or dermatologicalpreparations.

Advantageous hydrophilic active ingredients which (individually or inany combinations with one another) are stabilized by the use accordingto the invention in an excellent manner are those listed below:

biotin

carnitine and derivatives

creatine and derivatives

folic acid

pyridoxine

niacinamide

polyphenols (in particular flavonoids, very particularlyalpha-glucosylrutin)

ascorbic acid and derivatives

Hamamelis

Aloe Vera

panthenol

amino acids.

Particularly advantageous hydrophilic active ingredients for thepurposes of the present invention are also water-soluble antioxidants,such as, for example, vitamins.

The amount of hydrophilic active ingredients (one or more compounds) inthe preparations is preferably 0.0001 to 10% by weight, particularlypreferably 0.001 to 5% by weight, based on the total weight of thepreparation.

For the purposes of the present invention, dialkyl naphthalates in whichR¹ and/or R² represent branched alkyl groups having 6 to 10 carbon atomsare advantageous. For the purposes of the present invention, veryparticular preference is given to diethylhexyl naphthalate, which isavailable, for example, under the trade name Hallbrite TQ™ from CP Hallor Corapan TQ™ from H&R.

According to the invention, cosmetic or dermatological preparationsadvantageously comprise 0.001 to 30% by weight, preferably 0.01 to 20%by weight, very particularly preferably 1 to 15% by weight, of one ormore dialkyl naphthalates.

The cosmetic or dermatological photoprotection formulations according tothe invention can have the customary composition and be used forcosmetic or dermatological photoprotection, in addition for thetreatment, care and cleansing of the skin and/or of the hair and as amake-up product in decorative cosmetics.

Depending on their formulation, cosmetic or topical dermatologicalcompositions for the purposes of the present invention may be used, forexample, as skin protection cream, cleansing milk, day or night creametc. It is in some cases possible and advantageous to use thecompositions according to the invention as a basis for pharmaceuticalformulations.

For use, the cosmetic and dermatological preparations are applied to theskin and/or the hair in a sufficient amount in the manner customary forcosmetics.

The cosmetic and dermatological preparations according to the inventioncan comprise cosmetic auxiliaries as are customarily used in suchpreparations, e.g. preservatives, preservation helpers, bactericides,perfumes, substances to prevent foaming, dyes, pigments which have acoloring action, thickeners, moisturizing and/or humectant substances,fillers which improve the feel of the skin, fats, oils, waxes or othercustomary constituents of a cosmetic or dermatological formulation, suchas alcohols, polyols, polymers, foam stabilizers, electrolytes, organicsolvents or silicone derivatives.

Advantageous preservatives for the purposes of the present inventionare, for example, formaldehyde donors (such as e.g. DMDM hydantoin,which is available, for example, under the trade name Glydant™ fromLonza), iodopropyl butylcarbamates (e.g. those available under the tradenames Glycacil-L, Glycacil-S from Lonza, and/or Dekaben LMB from JanDekker), parabens (i.e. p-hydroxybenzoic alkyl esters, such as methyl,ethyl-, propyl- and/or butylparaben), phenoxyethanol, ethanol, benzoicacid and the like. According to the invention, the preservative systemusually also advantageously includes preservation helpers, such as, forexample, octoxyglycerol, glycine soya etc. as well.

Particularly advantageous preparations are also obtained whenantioxidants are used as additives or active ingredients. According tothe invention, the preparations advantageously comprise one or moreantioxidants. Favorable, but nevertheless optional antioxidants whichmay be used are all antioxidants customary or suitable for cosmeticand/or dermatological applications.

The amount of antioxidants (one or more compounds) in the preparationsis preferably 0.001 to 30% by weight, particularly preferably 0.05 to20% by weight, in particular 0.1 to 10% by weight, based on the totalweight of the preparation.

If vitamin E and/or derivatives thereof are the antioxidant orantioxidants, it is advantageous to choose their respectiveconcentrations from the range from 0.001 to 10% by weight, based on thetotal weight of the formulation.

If vitamin A or vitamin A derivatives, or carotenes or derivativesthereof are the antioxidant or antioxidants, it is advantageous tochoose their respective concentrations from the range from 0.001 to 10%by weight, based on the total weight of the formulation.

It is particularly advantageous when the cosmetic preparations accordingto the present invention comprise further cosmetic or dermatologicalactive ingredients, preferred active ingredients being antioxidantswhich can protect the skin against oxidative stress.

Advantageous further active ingredients are natural active ingredientsand/or derivatives thereof, such as e.g. ubiquinones, retinoids,carotenoids, creatine, taurine and/or β-alanine.

Formulations according to the invention, which comprise e.g. knownantiwrinkle active ingredients, such as flavone glycosides (inparticular α-glycosylrutin), coenzyme Q10, vitamin E and/or derivativesand the like, are particularly advantageously suitable for theprophylaxis and treatment of cosmetic or dermatological changes in skin,as arise, for example, during skin aging (such as, for example, dryness,roughness and formation of dryness wrinkles, itching, reduced refatting(e.g. after washing), visible vascular dilations (teleangiectases,couperosis), flaccidity and formation of wrinkles and lines, localhyperpigmentation, hypopigmentation and abnormal pigmentation (e.g. agespots), increased susceptibility to mechanical stress (e.g. cracking)and the like). In addition, they are advantageously suitable against theappearance of dry or rough skin.

The water phase of the preparations according to the invention canadvantageously comprise customary cosmetic auxiliaries, such as, forexample, alcohols, in particular those of low carbon number, preferablyethanol and/or isopropanol, diols or polyols of low carbon number, andethers thereof, preferably propylene glycol, glycerol, ethylene glycol,ethylene glycol monoethyl or monobutyl ether, propylene glycolmonomethyl, monoethyl or monobutyl ether, diethylene glycol monomethylor monoethyl ether and analogous products, polymers, foam stabilizers,electrolytes, and in particular one or more thickeners which mayadvantageously be chosen from the group consisting of silicon dioxide,aluminum silicates, polysaccharides or derivatives thereof, e.g.hyaluronic acid, xanthan gum, hydroxypropylmethylcellulose, particularlyadvantageously from the group of polyacrylates, preferably apolyacrylate from the group of so-called carbopols, for example Carbopol980, 981, 1382, 2984, 5984, in each case individually or in combination.

Also advantageous are copolymers of C₁₀₋₃₀-alkyl acrylates and one ormore monomers of acrylic acid, of methacrylic acid or esters thereofwhich are crosslinked with an allyl ether of sucrose or an allyl etherof pentaerythritol.

Compounds which bear the INCI name “Acrylates/C₁₀₋₃₀ Alkyl AcrylateCrosspolymer” are advantageous. Those available under the trade namesPemulen TR1 and Pemulen TR2 from B. F. Goodrich Company are particularlyadvantageous.

Compounds which bear the INCI name AmmoniumAcryloyldimethyltaurate/Vinylpyrrolidone copolymers are advantageous.

According to the invention, the AmmoniumAcryloyldimethyltaurate/Vinylpyrrolidone copolymers advantageously havethe empirical formula [C₇H₁₆N₂SO₄]_(n) [C₆H₉NO]_(m), corresponding to astatistical structure as follows

Preferred species for the purposes of the present invention are listedin Chemical Abstracts under the Registry numbers 58374-69-9, 13162-05-5and 88-12-0 and are available under the trade name Aristoflex® AVC fromClariant GmbH.

Also advantageous are copolymers/crosspolymers comprisingAcryloyldimethyl Taurate, such as, for example, Simugel® EG or Simugel®EG from Seppic S.A.

Moisturizers can also preferably be used.

Moisturizers is the term used for substances or mixtures of substanceswhich, following application or distribution on the surface of the skin,confer on cosmetic or dermatological preparations the property ofreducing the moisture loss by the horny layer (also calledtransepidermal water loss (TEWL)) and/or have a positive influence onthe hydration of the horny layer.

Advantageous moisturizers for the purposes of the present invention are,for example, glycerol, lactic acid and/or lactates, in particular sodiumlactate, butylene glycol, propylene glycol, biosaccaride gum-1, glycinesoya, ethylhexyloxyglycerol, pyrrolidonecarboxylic acid and urea. Inaddition, it is particularly advantageous to use polymeric moisturizersfrom the group of water-soluble and/or water-swellable and/orwater-gellable polysaccharides. Particularly advantageous are, forexample, hyaluronic acid, chitosan and/or a fucose rich polysaccharidewhich is listed in Chemical Abstracts under the Registry number178463-23-5 and is available, for example, under the name Fucogel®1000from SOLABIA S.A.

The cosmetic or dermatological preparations according to the inventioncan also advantageously, but not necessarily, comprise fillers which,for example, further improve the sensory and cosmetic properties of theformulations and, for example, bring about or intensify a velvety orsilky feel on the skin. Advantageous fillers for the purposes of thepresent invention are starch and starch derivatives (such as tapiocastarch, distarch phosphate, aluminum or sodium starch octenylsuccinateand the like), pigments which primarily have neither a UV filter effectnor a coloring effect (such as e.g. boron nitride etc.) and/or Aerosils®(CAS No. 7631-86-9).

The oil phase of the formulations according to the invention isadvantageously chosen from the group of polar oils, for example from thegroup of lecithins and of fatty acid triglycerides, namely thetriglycerol esters of saturated and/or unsaturated, branched and/orunbranched alkanecarboxylic acids with a chain length of from 8 to 24,in particular 12 to 18, carbon atoms. The fatty acid triglycerides can,for example, advantageously be chosen from the group of synthetic,semisynthetic and natural oils, such as e.g. cocoglyceride, olive oil,sunflower oil, soybean oil, peanut oil, rapeseed oil, almond oil, palmoil, coconut oil, castor oil, wheatgerm oil, grapeseed oil, thistle oil,evening primrose oil, macadamia nut oil and the like.

Also advantageous according to the invention are e.g. natural waxes ofanimal and vegetable origin, such as, for example beeswax and otherinsect waxes, and berry wax, shea butter and/or lanolin (wool wax).

Further advantageous polar oil components for the purposes of thepresent invention may also be chosen from the group of esters ofsaturated and/or unsaturated, branched and/or unbranchedalkanecarboxylic acids with a chain length of from 3 to 30 carbon atomsand saturated and/or unsaturated, branched and/or unbranched alcoholswith a chain length of from 3 to 30 carbon atoms, and from the group ofesters of aromatic carboxylic acids and saturated and/or unsaturated,branched and/or unbranched alcohols with a chain length of from 3 to 30carbon atoms. Such ester oils can then advantageously be chosen from thegroup consisting of octyl palmitate, octyl cocoate, octyl isostearate,octyldodecyl myristate, octyldodecanol, cetearyl isononanoate, isopropylmyristate, isopropyl palmitate, isopropyl stearate, isopropyl oleate,n-butyl stearate, n-hexyl laurate, n-decyl oleate, isooctyl stearate,isononyl stearate, isononyl isononanoate, 2-ethylhexyl palmitate,2-ethylhexyl laurate, 2-hexyldecyl stearate, 2-octyldodecyl palmitate,stearyl heptanoate, oleyl oleate, oleyl erucate, erucyl oleate, erucylerucate, tridecyl stearate, tridecyl trimellitate, and synthetic,semisynthetic and natural mixtures of such esters, such as e.g. jojobaoil.

The oil phase can also advantageously be chosen from the group ofdialkyl ethers and dialkyl carbonates, advantageous examples beingdicaprylyl ether (Cetiol OE) and/or dicaprylyl carbonate, for examplethat available under the trade name Cetiol CC from Cognis.

It is also preferred the oil component(s) from the group consisting ofisoeicosane, neopentyl glycol diheptanoate, propylene glycoldicaprylate/dicaprate, caprylic/capric/diglyceryl succinate, butyleneglycol dicaprylate/dicaprate, C₁₂₋₁₃-alkyl lactate, di-C₁₂₋₁₃-alkyltartrate, triisostearin, dipentaerythrityl hexacaprylate/hexacaprate,propylene glycol monoisostearate, tricaprylin, dimethylisosorbide. It isparticularly advantageous if the oil phase of the formulations accordingto the invention has a content of C₁₂₋₁₅-alkyl benzoate or consistsentirely of this.

Advantageous oil components are also e.g. butyloctyl salicylate (forexample that available under the trade name Hallbrite BHB from CP Hall),hexadecyl benzoate and butyloctyl benzoate and mixtures thereof(Hallstar AB).

Any desired mixtures of such oil and wax components can be usedadvantageously for the purposes of the present invention.

In addition, the oil phase can likewise advantageously also comprisenonpolar oils, for example those chosen from the group of branched andunbranched hydrocarbons and hydrocarbon waxes, in particular mineraloil, vaseline (petrolatum), paraffin oil, squalane and squalene,polyolefins, hydrogenated polyisobutenes and isohexadecane. Among thepolyolefins, polydecenes are the preferred substances.

The oil phase can also advantageously have a content of cyclic or linearsilicone oils or consist entirely of such oils, although it is preferredto use an additional content of other oil phase components apart fromthe silicone oil or the silicone oils.

Silicone oils are high molecular weight synthetic polymeric compounds inwhich silicon atoms are linked in a chain-like and/or network-likemanner via oxygen atoms, and the remaining valences of the silicon aresaturated by hydrocarbon radicals (in most cases methyl, less oftenethyl, propyl, phenyl groups etc.). Systematically, the silicone oilsare referred to as polyorganosiloxanes. The methyl-substitutedpolyorganosiloxanes, which represent the most significant compounds ofthis group in terms of number and are characterized by the followingstructural formula

are also referred to as polydimethylsiloxane or Dimethicone (INCI).There are dimethicones with various chain lengths and with variousmolecular weights.

For the purposes of the present invention, particularly advantageouspolyorganosiloxanes are, for example, dimethylpolysiloxanes[poly(dimethylsiloxane)], which are available, for example, under thetrade names Abil 10 to 10 000 from Th. Goldschmidt. Also advantageousare phenylmethylpolysiloxanes (INCI: Phenyl Dimethicone, PhenylTrimethicone), cyclic silicones (octamethylcyclotetrasiloxane orDecamethylcyclopentasiloxane), which are also referred to asCyclomethicones in accordance with INCI, amino-modified silicones (INCI:Amodimethicone) and silicone waxes, e.g. polysiloxane-polyalkylenecopolymers (INCI: Stearyl Dimethicone and Cetyl Dimethicone) anddialkoxydimethylpolysiloxanes (Stearoxy Dimethicone and Behenoxy StearylDimethicone), which are available as various Abil wax grades from Th.Goldschmidt. However, for the purposes of the present invention, othersilicone oils can also advantageously be used, for examplecetyldimethicone, hexamethylcyclotrisiloxane, polydimethylsiloxane,poly(methylphenylsiloxane).

For the purposes of the present invention, it is also advantageous tocreate cosmetic and dermatological preparations whose main purpose isnot protection against sunlight, but which nevertheless contain acontent of further UV protection substances. Thus, for example, UV-Aand/or UV-B filter substances are usually incorporated into day creamsor make-up products. UV protection substances, like antioxidants and, ifdesired, preservatives, represent effective protection of thepreparations themselves against decay. Also favorable are cosmetic anddermatological preparations which are in the form of a sunscreencomposition.

Accordingly, the preparations within the meaning of the presentinvention preferably comprise at least one further UV-A, UV-B and/orbroadband filter substance. The formulations may, but do notnecessarily, optionally also comprise one or more organic and/orinorganic pigments as UV filter substances, which may be present in thewater phase and/or the oil phase.

In addition, the preparations according to the invention canadvantageously also be in the form of so-called oil-free cosmetic ordermatological emulsions, which comprise a water phase and at least oneUV filter substance which is liquid at room temperature and/or one ormore silicone derivatives as the further phase. Oil-free formulationsfor the purpose of the present invention may advantageously alsocomprise further lipophilic components—such as, for example, lipophilicactive ingredients.

Particularly advantageous UV filter substances which are liquid at roomtemperature for the purposes of the present invention are homomenthylsalicylate (INCI: Homosalate), 2-ethylhexyl 2-cyano-3,3-diphenylacrylate(INCI: Octocrylene), 2-ethylhexyl 2-hydroxybenzoate(2-ethylhexylsalicylate, octyl salicylate, INCI: Octyl Salicylate) and esters ofcinnamic acid, preferably 4-methoxycinnamic 2-ethylhexylester(2-ethylhexyl 4-methoxycinnamate, INCI: Octyl Methoxycinnamate) and4-methoxycinnamic isopentyl ester(isopentyl 4-methoxycinnamate, INCI:Isoamyl p-Methoxycinnamate).

Preferred inorganic pigments are metal oxides and/or other metalcompounds which are sparingly soluble or insoluble in water, inparticular oxides of titanium (TiO₂), zinc (ZnO), iron (e.g. Fe₂O₃),zirconium (ZrO₂), silicon (SiO₂), manganese (e.g. MnO), aluminum(Al₂O₃), cerium (e.g. Ce₂O₃), mixed oxides of the corresponding metals,and mixtures of such oxides, and the sulfate of barium (BaSO₄).

The pigments can advantageously be used for the purposes of the presentinvention also in the form of commercially available oily or aqueouspredispersions. Dispersion auxiliaries and/or solubility promoters mayadvantageously be added to these predispersions.

The pigments may, according to the invention, advantageously besurface-treated (“coated”), the intention being, for example, to form orretain a hydrophilic, amphiphilic or hydrophobic character. This surfacetreatment can consist in providing the pigments with a thin hydrophilicand/or hydrophobic inorganic and/or organic layer by methods known perse. The various surface coatings for the purposes of the presentinvention may also comprise water.

Inorganic surface coatings for the purposes of the present invention mayconsist of aluminum oxide (Al₂O₃), aluminum hydroxide Al(OH)₃, oraluminum oxide hydrate (also: alumina, CAS No.: 1333-84-2), sodiumhexametaphosphate (NaPO₃)₆, sodium metaphosphate (NaPO₃)_(n), silicondioxide (SiO₂) (also: silica, CAS No.: 7631-86-9), or iron oxide(Fe₂O₃). These inorganic surface coatings may exist on their own, incombination and/or in combination with organic coating materials.

Organic surface coatings for the purposes of the present invention mayconsist of vegetable or animal aluminum stearate, vegetable or animalstearic acid, lauric acid, dimethylpolysiloxane, (also: dimethicone),methylpolysiloxane (methicone), simethicone (a mixture ofdimethylpolysiloxane with an average chain length of from 200 to 350dimethylsiloxane units and silica gel) or alginic acid. These organicsurface coatings may exist on their own, in combination and/or incombination with inorganic coating materials.

Zinc oxide particles and predispersions of zinc oxide particles whichare suitable according to the invention are available under thefollowing trade names from the companies listed:

Trade name Coating Manufacturer Z-Cote HP1 2% dimethicone BASF Z-Cote /BASF ZnO NDM 5% dimethicone H&R ZnO Neutral / H&R ZnO MZ 303 M 3%methicone Tayca Corp.

Suitable titanium dioxide particles and predispersions of titaniumdioxide particles are available under the following trade names from thecompanies listed:

Trade name Coating Manufacturer MT-100TV aluminum hydroxide/stearicTayca Corporation acid MT-100Z aluminum hydroxide/stearic TaycaCorporation acid Eusolex T-2000 alumina/simethicone Merck KgaA Titaniumdioxide octyltrimethylsilane Degussa T805 (Uvinul TiO₂) Tioveil AQalumina/silica Solaveil/ 10PG Uniquema

Further advantageous pigments are latex particles. Latex particles whichare advantageous according to the invention are those described in thefollowing specifications: U.S. Pat. No. 5,663,213 and EP 0 761 201.Particularly advantageous latex particles are those which are formedfrom water and styrene/acrylate copolymers and are available, forexample, under the trade name “Alliance SunSphere” from Rohm & Haas.

Advantageous UV-A filter substances for the purposes of the presentinvention are dibenzoylmethane derivatives, in particular4-(tert-butyl)-4′-methoxydibenzoylmethane (CAS No. 70356-09-1), which issold by Givaudan under the name Parsol® 1789 and by Merck under thetrade name Eusolex® 9020.

Advantageous further UV filter substances for the purposes of thepresent invention are sulfonated, water-soluble UV filters, such as, forexample,

-   -   phenylene-1,4-bis(2-benzimidazyl)-3,3′-5,5′-tetrasulfonic acid        and its salts, particularly the corresponding sodium, potassium        or triethanolammonium salts, in particular the        phenylene-1,4-bis(2-benzimidazyl)-3,3′-5,5′-tetrasulfonic        bis-sodium salt with the INCI name Bisimidazylate (CAS No.:        180898-37-7), which is available, for example, under the trade        name Neo Heliopan AP from Haarmann & Reimer;    -   salts of 2-phenylbenzimidazole-5-sulfonic acid, such as its        sodium, potassium or its triethanolammonium salt, and the        sulfonic acid itself with the INCI name Phenylbenzimidazole        Sulfonic Acid (CAS No. 27503-81-7), which is available, for        example, under the trade name Eusolex 232 from Merck or under        Neo Heliopan Hydro from Haarmann & Reimer;    -   1,4-di(2-oxo-10-sulfo-3-bornylidenemethyl)benzene (also:        3,3′-(1,4-phenylene-dimethylene)bis(7,7-dimethyl-2-oxobicyclo[2.2.1]hept-1-ylmethane        sulfonic acid) and salts thereof (particularly the corresponding        10-sulfato compounds, in particular the corresponding sodium,        potassium or triethanolammonium salt), which is also referred to        as benzene-1,4-di(2-oxo-3-bornylidenemethyl-10-sulfonic acid).        Benzene-1,4-di(2-oxo-3-bornylidenemethyl-10-sulfonic acid) has        the INCI name Terephthalidene Dicamphor Sulfonic Acid (CAS No.:        90457-82-2) and is available, for example, under the trade name        Mexoryl SX from Chimex;    -   sulfonic acid derivatives of 3-benzylidenecamphor, such as e.g.        4-(2-oxo-3-bornylidenemethyl)benzenesulfonic acid,        2-methyl-5-(2-oxo-3-bornylidene-methyl)sulfonic acid and salts        thereof.

Advantageous UV filter substances for the purposes of the presentinvention are also so-called broadband filters, i.e. filter substanceswhich absorb both UV-A- and also UV-B-radiation.

Advantageous broadband filters or UV-B filter substances are, forexample, triazine derivatives, such as e.g.

-   -   2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine        (INCI: Methylene Bis-Benzotriazolmethylbutylphenol), which is        available under the trade name Tinosorb® S from CIBA-Chemikalien        GmbH;    -   dioctylbutylamidotriazone (INCI: Diethylhexylbutamidotriazone),        which is available under the trade name UVASORB HEB from Sigma        3V;    -   tris(2-ethylhexyl)4,4′,4″-(1,3,5-triazine-2,4,6-triyltriimino)trisbenzoate),        also:        2,4,6-tris[anilino(p-carbo-2′-ethyl-1′-hexyloxy)]-1,3,5-triazine        (INCI: Octyl Triazone), which is sold by BASF Aktiengesellschaft        under the trade name UVINUL® T 150.

An advantageous broadband filter for the purposes of the presentinvention is also2,2′-methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol) (INCI: Bisoctyltriazole), which is available under thetrade name Tinosorb® M from CIBA-Chemikalien GmbH.

An advantageous broadband filter for the purposes of the presentinvention is also2-(2H-benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]disiloxanyl]propyl]phenol(CAS No.: 155633-54-8) with the INCI name Drometrizole Trisiloxane.

The further UV filter substances may be oil-soluble. Advantageousoil-soluble filter substances are e.g.:

-   -   3-benzylidenecamphor derivatives, preferably        3-(4-methylbenzylidene)camphor, 3-benzylidenecamphor;    -   4-aminobenzoic acid derivatives, preferably 2-ethylhexyl        4-(dimethylamino)benzoate, amyl 4-(dimethylamino)benzoate;    -   derivatives of benzophenone, preferably        2-hydroxy-4-methoxybenzophenone,        2-hydroxy-4-methoxy-4′-methylbenzophenone,        2,2′-dihydroxy-4-methoxybenzo-phenone    -   and UV filters bound to polymers.

A further photoprotective filter substance to be used advantageouslyaccording to the invention is ethylhexyl 2-cyano-3,3-diphenylacrylate(Octocrylene), which is available from BASF under the name Uvinul® N539.

Particularly advantageous preparations for the purposes of the presentinvention, which may be characterized by a high or very high UV-Aprotection, comprise, as well as the filter substance(s) according tothe invention, preferably also further UV-A and/or broadband filters, inparticular dibenzoylmethane derivatives [for example4-(tert-butyl)-4′-methoxydibenzoylmethane] and/or2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine,in each case individually or in any combinations with one another.

The list of UV filters specified which can be used for the purposes ofthe present invention is not of course intended to be limiting.

Advantageously, the preparations according to the invention comprise thesubstances which absorb UV radiation in the UV-A and/or UV-B region in atotal amount of e.g. 0.1% by weight to 30% by weight, preferably 0.5 to20% by weight, in particular 1.0 to 15.0% by weight, in each case basedon the total weight of the preparations, in order to provide cosmeticpreparations which protect the hair and/or the skin from the entirerange of ultraviolet radiation.

In addition, it may in some instances be advantageous to incorporatefilm formers into the cosmetic or dermatological preparations accordingto the invention, for example in order to improve the water resistanceof the preparations or to increase the UV protection performance (UV-Aand/or UV-B boosting). Water-soluble or dispersible and also fat-solublefilm formers are suitable, in each case individually or in combinationwith one another.

Advantageus water-soluble or dispersible film formers are e.g.polyurethanes (e.g the Avalure® grades from Goodrich), dimethiconecopolyol polyacrylate (Silsoft Surface® from Witco Organo SiliconesGroup), PVP/VA (VA=vinyl acetate) copolymer (Luviscol VA 64 Powder fromBASF) etc.

Advantageous fat-soluble film formers are e.g. the film formers from thegroup of polymers based on polyvinylpyrrolidone (PVP)

Particular preference is given to copolymers of polyvinylpyrrolidone,for example the PVP hexadecene copolymer and the PVP eicosene copolymer,which are available under the trade names Antaron V216 and Antaron V220from GAF Chemicals Cooperation and also tricontayl PVP and the like.

The examples below serve to illustrate the present invention withoutlimiting it. The numerical values in the examples are percentages byweight, based on the total weight of the particular preparations.

EXAMPLES

1. O/W sunscreen emulsions 1 2 3 4 5 6 7 Glycerol monostearate 0.50 1.003.00 1.50 SE Glyceryl stearate 2.00 1.00 2.00 2.50 citrate Stearic acid3.00 2.00 PEG-40 stearate 0.50 2.00 Cetyl dimethicone 0.75 0.50 copolyolCetyl phosphate 1.00 Stearyl alcohol 3.00 2.00 0.50 Cetyl Alcohol 2.501.00 1.50 0.50 2.00 Ethylhexyl 6.00 8.00 methoxycinnamate Anisotriazine1.50 2.50 2.50 2,50 Butylmethoxy- 1.00 3.00 2.80 1.50 dibenzoylmethaneBisimidazylate 0.50 1.70 Ethylhexyltriazone 4.00 3.00 4.00 2.00Octocrylene 4.00 2.50 Diethylhexylbutamido- 1.00 1.00 triazonePhenylbenzimidazole- 0.50 sulfonic acid Bioctyltriazole 2.00 0.50 2.50Homosalate 2.00 Ethylhexyl salicylate 3.00 5.00 Drometrizole 0.5 1.00trisiloxane Terephthalidenedi- 1.50 1.00 0.50 camphor sulfonic acidDiethylhexyl 3.50 4.80 7.00 9.50 6.70 5.50 8.00 2,6-naphthalate Titaniumdioxide 1.00 3.00 2.00 MT-100Z Zinc oxide NDM 1.50 2.00 3.00 C12–15alkyl benzoate 2.50 4.00 7.00 5.00 Dicaprylyl ether 3.50 2.00 Butyleneglycol 5.00 6.00 dicaprylate/dicaprate Dibutyl adipate 6.00 2.00 2.00Dimethicone 0.50 1.00 2.00 Cyclomethicone 2.00 0.50 0.50 Shea butter2.00 0.50 PVP hexadecene 0.50 0.50 1.00 1.00 copolymer Tricontanyl PVP0.50 1.00 1.00 Glycerol 3.00 7.50 7.50 5.00 2.50 Xanthan gum 0.15 0.050.30 Sodium carbomer 0.20 0.10 0.20 Vitamin E acetate 0.50 0.25 0.500.75 1.00 Alpha-glucosylrutin 0.25 0.75 0.20 Ascorbic acid 2.50Panthenol 1.50 5.00 Aloe Vera 1.50 3.50 DMDM hydantoin 0.60 0.40 0.20Konkaben LMB ® 0.18 0.20 0.10 0.15 Methylparaben 0.15 0.25 0.50Phenoxyethanol 1.00 0.40 0.40 0.50 0.40 0.60 EDTA 0.20 0.35 0.50 0.020.03 Iminodisuccinic acid 0.35 0.10 0.10 Ethanol 2.00 1.50 3.00 1.00Perfume 0.20 0.20 0.20 0.20 Water ad ad ad ad ad ad ad 100 100 100 100100 100 100

2. Hydrodispersions 1 2 3 4 5 PEG-40 stearate 1.00 0.5  Cetyl alcohol1.00 Sodium carbomer 0.20 0.30 Acrylates/C10–30 alkyl 0.50 0.40 0.100.10 acrylate crosspolymer Xanthan gum 0.30 0.15 0.50 Ethylhexyl 5.008.00 methoxycinnamate Anisotriazine 2.00 2.50 Butylmethoxy- 0.50 2.003.00 2.50 dibenzoylmethane Bisimidazylate 1.50 3.00 Ethylhexyltriazone3.00 4.00 Octocrylene 4.00 3.90 2.50 Diethyhexyl- 2.00 butamidotriazonePhenylbenzimidazole- 3.00 sulfonic acid Drometrizole trisiloxane 1.001.50 Terephthalidene- 0.50 1.00 dicamphorsulfonic acid Diethylhexyl 4.508.00 7.20 5.50 9.80 2,6-naphthalate Titanium dioxide 2.00 1.00 MT-100TVZinc oxide HP1 3.00 C12–15 alkyl benzoate 2.00 2.50 Butylene glycol 4.002.00 6.00 dicaprylate/dicaprate Dicaprylyl carbonate 2.00 6.00Dimethicone 0.50 1.00 Shea butter 2.00 3.50 1.50 PVP hexadecene 0.500.50 1.00 copolymer Ethylhexylglycerol 1.00 0.50 Glycerol 3.00 7.50 7.502.50 Glycine soya 1.50 Vitamin E 0.50 0.25 1.00 Alpha-glucosylrutin 1.000.25 0.75 Ascorbyl palmitate 0.25 0.65 0.40 DMDM hydantoin 0.60 0.400.20 Konkaben LMB ® 0.20 0.15 Methylparaben 0.50 0.25 0.15Phenoxyethanol 0.50 0.40 1.00 0.60 Iminodisuccinic acid 0.50 0.35 1.00Ethanol 3.00 2.00 1.50 1.00 Perfume 0.20 0.20 0.20 Water ad 100 ad 100ad 100 ad 100 ad 100

3. W/O sunscreen emulsions 1 2 3 4 5 Cetyldimethicone 2.50 4.00 copolyolPolyglyceryl-2 5.00 7.00 dipolyhydroxystearate PEG-30 dipoly- 5.00hydroxystearate Laurylmethicone 3.00 2.00 copolyol Ethylhexyl 8.00 5.004.00 methoxycinnamate Anisotriazine 2.50 2.00 2.00 2.50 Butylmethoxy-3.00 1.00 0.70 dibenzoylmethane Bisimidazylate 2.00 2.60Ethylhexyltriazone 3.00 4.00 4-Methylbenzylidene- 2.00 4.00 2.00 camphorOctocrylene 2.50 3.90 2.50 Diethyhexylbutamido- 2.00 triazonePhenylbenzimidazole- 3.00 2.00 sulfonic acid Bisoctyltriazole 2.00 0.50Dimethicone 1.50 0.50 diethylbenzalmalonate Drometrizole trisiloxane1.00 1.50 Terephthalidene- 1.00 0.50 dicamphorsulfonic acid Diethylhexyl7.50 5.50 8.50 4.00 12.00 2,6-naphthalate Titanium dioxide T805 2.001.50 3.00 Z-Cote HP1 8.00 2.00 Mineral oil 5.00 10.0 8.00 C12–15 alkylbenzoate 5.00 9.00 Dicaprylyl ether 10.00 7.00 Butylene glycol 2.00 8.004.00 dicaprylate/dicaprate Dicaprylyl carbonate 5.00 6.00 Dimethicone4.00 1.00 5.00 Cyclomethicone 2.00 25.00 2.00 Shea butter 2.00 3.00 PVPhexadecene 0.50 0.50 1.00 copolymer Ethylhexylglycerol 0.30 1.00 0.50Glycerol 3.00 7.50 7.50 2.50 Glycine soya 1.00 1.50 MgSO₄ 1.00 0.50 0.50Vitamin E acetate 0.50 0.25 1.00 Alpha-glucosylrutin 0.50 1.00 Aloe Vera0.15 0.50 4.00 1.50 Biotin 3.00 DMDM hydantoin 0.60 0.40 0.20Methylparaben 0.50 0.25 0.15 Phenoxyethanol 0.50 0.40 1.00 0.60 EDTA0.20 0.35 0.15 Ethanol 3.00 6.00 1.00 Perfume 0.20 0.20 0.20 Water ad100 ad 100 ad 100 ad 100 ad 100

4. Solids-stabilized emulsions 1 2 3 4 5 Mineral oil 16.0 16.0Octyldodecanol 9.0 9.0 5.0 Caprylic/capric 9.0 9.0 6.0 triglycerideC12–15 alkylbenzoate 5.0 8.0 Butylene glycol 3.5 8.0dicaprylate/dicaprate Dicaprylyl ether 9.0 4.0 Dicaprylyl carbonate 9.0Hydroxyoctacosanyl 2.0 2.0 2.0 2.0 1.5 hydroxystearate Disteardimonium1.0 0.5 0.5 0.25 hectorite Cera Microcristallina + 5.0 ParaffinumLiquidum Hydroxypropyl- 0.15 0.05 methylcellulose Dimethicone 2.50 3.0Butylmethoxy- 0.50 3.50 1.50 0.50 dibenzoylmethane Ethylhexyl 3.0methoxycinnamate Diethylhexylbutamido- 2.50 4.0 triazoneBisoctyltriazole 1.00 2.0 Drometrizole trisiloxane 0.50 1.00Terephthalidene- 1.00 0.50 1.50 dicamphorsulfonic acid Bisimidazylate2.00 3.10 1.50 0.50 Eusolex ® T-2000 2.0 4.0 2.0 4.0 Titanium dioxide T805 3.0 Zinc oxide HP1 6.0 Silica dimethyl silylate 1.0 Boron nitride2.0 Starch/sodium 0.5 metaphosphate polymer Diethylhexyl 5.00 7.00 8.503.00 4.50 2,6-naphthalate Tapioca starch 1.0 Biotin 0.20 1.50 0.50Alpha-glucosylrutin 1.50 2.00 3.00 Sodium chloride 1.0 1.0 1.0 1.0 1.0Glycerol 5.0 10.0 3.0 6.0 10.0 Trisodium EDTA 1.0 1.0 Methylparaben 0.210.2 Propylparaben 0.07 Phenoxyethanol 0.5 0.4 0.4 0.5 Hexamidinediisethionate 0.08 Diazolidinylurea 0.28 0.28 Alcohol 2.5 Perfume q.s.q.s. q.s. q.s. q.s. Water ad 100 ad 100 ad 100 ad 100 ad 100

5. PIT emulsions 1 2 3 4 5 6 7 8 Glycerol monostearate SE 5.50 2.00 3.005.00 0.50 4.00 Glyceryl isostearate 3.50 4.00 2.00 Isoceteth-20 0.502.00 Ceteareth-12 1.00 5.00 1.00 3.50 Ceteareth-20 4.50 2.00 2.50 3.00PEG-100 stearate 1.00 1.00 0.50 Cetyl alcohol 2.50 1.00 1.50 0.50 1.50Cetyl palmitate 0.50 1.00 Cetyl dimethicone copolyol 0.50 0.50 1.00Polyglyceryl-2 0.75 0.25 dipolyhydroxystearate Diethylhexyl2,6-naphthalate 7.0 3.5 1.0 6.0 0.5 4.0 5.0 4.5 Anisotriazine 0.50 2.003.00 Butylmethoxydibenzoylmethane 1.00 5.00 Bisimidazylate 2.00 1.00Terephthalidenedicamphor- 0.50 1.00 sulfonic acid Drometrizoletrisiloxane 2.00 3.00 1.00 Ethylhexyl methoxycinnamate 4.50 5.00 8.00Ethylhexyl salicylate 3.50 4.00 Dioctylbutamidotriazone 3.00 2.00 2.001.50 Ethylhexyltriazone 2.00 4.00 1.50 3.00 Dimethicone 4.50 3.50diethylbenzalmalonate Octocrylene 5.00 8.00 7.50Phenylbenzimidazolesulfonic 5.00 3.00 1.00 acid C12–15 alkyl benzoate3.50 6.50 4.00 Cocoglycerides 3.00 3.00 2.50 3.50 Dicaprylyl ether 4.00Butylene glycol dicaprylate/ 4.00 3.00 dicaprate Dicaprylyl carbonate0.50 6.00 Dibutyl adipate 2.50 3.00 1.00 Cyclomethicone 3.00 4.00 PVPhexadecene copolymer 1.00 1.50 Glycerol 10.0 5.00 7.50 Tocopherol 1.000.75 0.50 1.00 0.25 Alpha-glucosylrutin 0.45 0.50 1.00 0.25 0.15Hammamelis extract 5.00 10.00 4.50 Aloe Vera 5.00 2.50 Shea butter 2.000.50 Iodopropyl butylcarbamate 0.12 0.20 0.15 DMDM hydantoin 0.10Methylparaben 0.50 0.25 0.45 Phenoxyethanol 0.50 0.40 1.00 1.00Octoxyglycerol 0.30 1.00 Ethanol 2.00 7.50 4.00 Trisodium EDTA 0.40 0.150.20 0.50 Perfume 0.20 0.20 0.20 0.45 0.20 Water ad ad ad ad ad ad ad ad100 100 100 100 100 100 100 100

1. A cosmetic or dermatological formulation, comprising: at least onehydrophilic active ingredient, the at least one hydrophilic activeingredient is present in an amount from 0.0001 to 10% by weight, basedon the total weight of the formulation, and at least one dialkylnaphthalate which is characterized by the structural formula

in which R¹ and R², independently of one another, are selected from thegroup consisting of branched and unbranched alkyl groups having 6 to 24carbon atoms.
 2. The formulation as claimed in claim 1, wherein the atleast one dialkyl naphthalate is present in an amount from 0.001 to 30%by weight, based on the total weight of the formulation.
 3. Theformulation as claimed in claim 1, wherein the at least one dialkylnaphthalate is present in an amount from 0.01 to 20% by weight, based onthe total weight of the formulation.
 4. The formulation as claimed inclaim 1, wherein the at least one dialkyl naphthalate is present in anamount from 1 to 15% by weight, based on the total weight of theformulation.
 5. The formulation as claimed in claim 1, wherein at leastone of R¹ and R² is a branched alkyl group having 6 to 10 carbon atoms.6. The formulation as claimed in claim 1, wherein R¹ and R² are branchedalkyl groups having 6 to 10 carbon atoms.
 7. The formulation as claimedin claim 1, wherein the at least one dialkyl naphthalate includesdiethylhexyl naphthalate.
 8. The formulation as claimed in claim 1,wherein the at least one hydrophilic active ingredient is present in anamount from 0.001 to 5% by weight, based on the total weight of theformulation.
 9. The formulation as claimed in claim 1, wherein the atleast one hydrophilic active ingredient is selected from the groupconsisting of biotin, carnitine and derivatives thereof, creatine andderivatives thereof, folic acid, pyridoxine, niacinamide, polyphenols,ascorbic acid and derivatives thereof, Hamamelis, Aloe Vera, panthenoland amino acids.
 10. The formulation as claimed in claim 9, wherein theat least one hydrophilic active ingredient includes an active ingredientselected from the group consisting of biotin, carnitine, flavonoids, andascorbic acid.
 11. The formulation as claimed in claim 9, wherein the atleast one hydrophilic active ingredient includes a polyphenol and thepolyphenol is a flavonoid.
 12. The formulation as claimed in claim 11,wherein the flavonoid is alpha-glucosylrutin.
 13. The formulation asclaimed in claim 1, further comprising at least one UV filter substanceselected from the group consisting of triazines, benzotriazoles, UVfilters which are liquid at room temperature, organic pigments andinorganic pigments.
 14. The formulation as claimed in claim 1, furthercomprising at least one fat-soluble active ingredient.
 15. Theformulation as claimed in claim 14, wherein the at least one fat-solubleactive ingredient includes vitamin E or a vitamin E derivative.
 16. Theformulation as claimed in claim 15, wherein the vitamin E or a vitamin Ederivative is present in an amount from 0.001 to 10% by weight, based onthe total weight of the formulation.
 17. The formulation as claimed inclaim 14, wherein the at least one fat-soluble active ingredientincludes an active ingredient selected from the group consisting ofvitamin A, vitamin A derivatives, carotene and carotene derivatives. 18.The formulation as claimed in claim 17, wherein the active ingredientselected from the group consisting of vitamin A, vitamin A derivatives,carotene and carotene derivatives is present in an amount from 0.001 to10% by weight, based on the total weight of the formulation.
 19. Theformulation as claimed in claim 1, further comprising at least oneactive ingredient selected from the group consisting of ubiquinones,retinoids, caroretinoids, creatine, taurine and β-alanine.
 20. Theformulation as claimed in claim 1, further comprising at least one UV-Afilter substance or one broadband filter selected from the groupconsisting of 4-(tert-butyl)-4′-methoxydibenzoylmethane;2,4-bis{[4-(2-ethy]hexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine,phenylene-1,4-bis(2-benzimidazyl)-3,3′-5,5′-tetra-sulfonic acidbis-sodium salt, and mixtures thereof.
 21. The formulation as claimed inclaim 1, wherein the formulation is an oil-in-water emulsion.
 22. Theformulation as claimed in claim 21, wherein the oil-in-water emulsion isa sunscreen emulsion and further comprises at least one UV filtersubstance, said at least one dialkyl naphthalate being present in anamount from 3.5 to 9.5% by weight, based on the total weight of theformulation.
 23. The formulation as claimed in claim 21, wherein theoil-in-water emulsion is a sunscreen emulsion and further comprises atleast one UV filter substance, said at least one dialkyl naphthalatebeing diethylhexyl naphthalate and present in an amount from 1 to 15% byweight, based on the total weight of the formulation.
 24. Theformulation as claimed in claim 1, wherein the formulation is ahydrodispersion.
 25. The formulation as claimed in claim 24, whereinsaid at least one dialkyl naphthalate is present in an amount from 4.5to 9.8% by weight, based on the total weight of the formulation.
 26. Theformulation as claimed in claim 24, wherein said at least one dialkylnaphthalate is diethylhexyl naphthalate and is present in an amount from1 to 15% by weight, based on the total weight of the formulation. 27.The formulation as claimed in claim 1, wherein the formulation is awater-in-oil emulsion.
 28. The formulation as claimed in claim 27,wherein the water-in-oil emulsion is a sunscreen emulsion and furthercomprises at least one UV filter substance, said at least one dialkylnaphthalate being present in an amount from 4.0 to 12.0% by weight,based on the total weight of the formulation.
 29. The formulation asclaimed in claim 27, wherein the water-in-oil emulsion is a sunscreenemulsion and further comprises at least one UV filter substance, said atleast one dialkyl naphthalate being diethylhexyl naphthalate and presentin an amount from 1 to 15% by weight, based on the total weight of theformulation.
 30. The formulation as claimed in claim 1, wherein theformulation is a solids stabilized emulsion.
 31. The formulation asclaimed in claim 30, wherein said at least one dialkyl naphthalate beingpresent in an amount from 3.0 to 8.5% by weight, based on the totalweight of the formulation.
 32. The formulation as claimed in claim 30,wherein said at least one dialkyl naphthalate is diethylhexylnaphthalate and present in an amount from 1 to 15% by weight, based onthe total weight of the formulation.
 33. The formulation as claimed inclaim 1, wherein the formulation is a PIT emulsion.
 34. The formulationas claimed in claim 33, wherein said at least one dialkyl naphthalatebeing present in an amount from 0.5 to 7.0% by weight, based on thetotal weight of the formulation.
 35. The formulation as claimed in claim33, wherein said at least one dialkyl naphthalate is diethylhexylnaphthalate and present in an amount from 1 to 15% by weight, based onthe total weight of the formulation.
 36. A cosmetic or dermatologicalformulation, comprising: at least one hydrophilic active ingredientselected from the group consisting of biotin, carnitine and derivativesthereof, creatine and derivatives thereof, folic acid, pyridoxine,niacinamide, polyphenols, ascorbic acid and derivatives thereof,Hamamelis, Aloe Vera, panthenol and amino acids, in an amount from 0.001to 5% by weight, based on the total weight of the formulation, anddiethylhexyl naphthalate in an amount from 1 to 15% by weight, based onthe total weight of the formulation.
 37. A method for moisturizing skin,comprising applying to the skin a cosmetic or dermatologicalformulation, comprising at least one hydrophilic active ingredient, theat least one hydrophilic active ingredient is present in an amount from0.0001 to 10% by weight, based on the total weight of the formulation,and at least one dialkyl naphthalate which is characterized by thestructural formula

in which R¹ and R², independently of one another, are selected from thegroup consisting of branched and unbranched alkyl groups having 6 to 24carbon atoms.
 38. A method for protecting the skin against photoinducedskin aging, comprising applying to the skin a cosmetic or dermatologicalformulation, comprising at least one hydrophilic active ingredient, theat least one hydrophilic active ingredient is present in an amount from0.0001 to 10% by weight, based on the total weight of the formulation,and at least one dialkyl naphthalate which is characterized by thestructural formula

in which R¹ and R², independently of one another, are selected from thegroup consisting of branched and unbranched alkyl groups having 6 to 24carbon atoms.
 39. A method for improving the effectiveness of at leastone hydrophilic active ingredient in a cosmetic or dermatologicalformulation, said method comprising adding to the cosmetic ordermatological formulation at least one dialkyl naphthalate which ischaracterized by the structural formula

in which R¹ and R², independently of one another, are selected from thegroup consisting of branched and unbranched alkyl groups having 6 to 24carbon atoms, and the at least one hydrophilic active ingredient beingpresent in an amount from 0.0001 to 10% by weight, based on the totalweight of the formulation.
 40. A method for increasing the stability ofat least one hydrophilic active ingredient against decomposition in acosmetic or dermatological formulation, said method comprising adding tothe cosmetic or dermatological formulation at least one dialkylnaphthalate which is characterized by the structural formula

in which R¹ and R², independently of one another, are selected from thegroup consisting of branched and unbranched alkyl groups having 6 to 24carbon atoms, and the at least one hydrophilic active ingredient beingpresent in an amount from 0.0001 to 10% by weight, based on the totalweight of the formulation.